1 Features

• 16-bit Multi-Nyquist DAC core

• DAC sample rate:

– NRZ, RF Modes: 22GSPS

– DES2xL, DES2xH modes: 44GSPS

• Maximum input data rate:

– 12-bit, Dual channel: 21GSPS/ch

– 16-bit, Dual channel: 15.75GSPS/ch

– 16-bit, Single channel: 22GSPS

• Output frequency range: >18GHz

• Performance at fOUT = 10GHz, DES2xL mode

– Noise floor (small signal): –170dBFS/Hz

– SFDR (-0.1dBFS) : –55dBc

– IMD3 (-7dBFS each tone) : –60dBc

– Additive phase noise, 10kHz offset: -132dBc/Hz

• Optional PLL/VCO for DAC clock generation

• Four integrated digital up-converters (DUC)

– Interpolation: 1x, 4x, 6x, 8x to 256x

– Complex baseband DUC for I/Q output

– Complex to real upconversion for direct RF

sampling

– 64-bit frequency resolution NCOs

– Phase continuous, synchronous and reset

options with frequency hopping

• Programmable FIR equalizer at DUC input or DAC

input

• Direct digital synthesis (DDS) functions

– Four piecewise linear waveform generators

• 16 Prestored waveforms

• 256 Total vectors

• Automatic or synchronous external triggers

– Frequency, amplitude, phase interface

streaming

• JESD204C Interface

– 16 Lanes at up to 32.5Gbps

– Class C-S, subclass-1 compatible

• Automatic clock and SYSREF calibration and

tracking

2 Applications

• Satellite Communications (SATCOM)

• Phased Array Antenna Systems

• Synthetic Aperture Radar (SAR) Exciter

• Wireless Communications Testers

• Arbitrary Waveform Generator (AWG)

3 Description

The DAC39RF20 is a single and dual channel digitalto-

analog converter (DAC) with 16-bit resolution.

With an external full rate clock, the devices support

22GSPS with single edge sampling modes (NRZ

and RF) and 44GSPS in dual edge sampling modes

(DES2XL, DES2XH). When using the internal PLL/

VCO, the devices support 17GSPS with single edge

sampling modes (NRZ and RF) and 34GSPS in

dual edge sampling modes (DES2XL, DES2XH).

The devices can be used as noninterpolating or

interpolating DACs for either direct RF sampling or

complex baseband signal generation. The maximum

input data rate for two channels is 21GSPS (12-bit

resolution) or 15.75GSPS (16-bit resolution). The

maximum rate for one channel is 22GSPS (16-bit

resolution). The device can generate signals greater

than 10GHz bandwidth at frequencies exceeding

20GHz, enabling direct sampling through Ku band.